Specifications given herein may be changed at any time without prior notice.
Please confirm technical specifications before you order and/or use.
TECHNOLOGY OF TOMORROW
Revision: 5. Nov. 2004
EUROPE GmbH • Kaddenbusch 6 • D-25578 Dägeling / ITZEHOE • PHONE: +49 (0) 48 21/89 89-0 • FAX: +49 (0) 48 21/89 89 89 • Internet: www.koaeurope.de
THERMAL SENSORS / CIRCUIT PROTECTORS
THERMAL SENSORS
CIRCUIT PROTECTORS
Products with Pb-free terminations
meet RoHS requirements
2H
2E
2B
1J, 2A
3A
RF73 2A 2.0 1.25 ± 0.1 0.4 ± 0.2 0.3
RF73 2B 3.2 1.6 ± 0.2
RF73 2E 2.6 ± 0.2 0.5 ± 0.3 0.6
RF73 2H 5.0 2.5 ± 0.2
RF73 3A 6.3 3.1 ± 0.2
CIRCUIT PROTECTORS
FUSIBLE FLAT CHIP
RESISTORS
RF73
1Ceramic substrate
2Top termination
3Bottom termination
4Fusible resistive film
5Protective layer
6End termination (Ni Cr)
7Diffusion barrier (Ni)
8Solder plating
STRUCTURE
RF73 Brown Black, 3 digits
IDENTIFICATION
PRODUCT CODE COATING COLOR MARKING
DIMENSIONS (mm)
RATING
EXAMPLE OF FUSING CHARACTERISTICSONE PULSE LIMITING ELECTRIC POWER
C d t ± 0.1WTYPE L ± 0.2
FEATURES
■Small and light with the same configuration as a flat chip resistor (RK73 series)
■Works as a resistor in normal operation
■Fuses quickly and protects circuits when excessive voltage is applied
■Anti-Leaching nickel barrier terminations
■Fusing time: max. 60 sec.
■Recognized by safety standard UL1412 (2A/0805…3A/2512) (1J/0603 is not recognized)
■Meets or exceeds IEC 60115-8, JIS C 5201-8, EIAJ RC-2124
■Rated ambient temperature: + 70° C
■Operating temperature range: - 55° C ... + 125° C
■Suitable for reflow and wave soldering
SIZE TYPE POWER
RATING* T.C.R. RESISTANCE
RANGE
(E24)
FUSING CHARACTERISTICS
(FUSING POWER)
0805 RF73 2A 0.1 W 3.0 W 2.6 W 2.4 W 2.1 W 2.0 W
0.2 Ω…0.47 Ω0.51 Ω…1.0 Ω1.1 Ω…20 Ω22 Ω…100 Ω110 Ω…510 Ω
1206 RF73 2B 0.125 W 0.2 Ω3.75 W 2.875 W 2.5 W 2.0 W 1.75 W
…0.2 Ω…0.47 Ω0.51 Ω…10 Ω11 Ω…24 Ω27 Ω…100 Ω110 Ω…510 Ω
1210 RF73 2E 0.25 W 510 Ω4.5 W 4.1 W 3.5 W 3.2 W 3.0 W
0.2 Ω…0.47 Ω0.51 Ω…4.7 Ω5.1 Ω…27 Ω30 Ω…100 Ω110 Ω…510 Ω
2010 RF73 2H 0.5 W J (±5%) 5.5 W 5.0 W 4.0 W 3.5 W 3.2 W
0.2 Ω…0.47 Ω0.51 Ω…4.7 Ω5.1 Ω…27 Ω30 Ω…100 Ω110 Ω…510 Ω
2512 RF73 3A 1.0 W 6.5 W 6.0 W 5.0 W 4.5 W 4.0 W
0.2 Ω…0.47 Ω0.51 Ω…4.7 Ω5.1 Ω…30 Ω33 Ω…100 Ω110 Ω…510 Ω
0 1 2 3 4 5 6 7 8
001 0.1 1 10 100
2A 2B 2E 2H
3A
1J
10
10
1
100
Fusing time (s.)
Limiting electric power (W)
Fusing Power (W)
Pulse duration (ms)
+1000…
–500 ppm/K
(0.2Ω…4.3Ω)
±500 ppm/K
(4.7Ω…510Ω)
TYPE DESIGNATION (HOW TO ORDER)
*Please see “PACKAGING”
RF73B
PRODUCT CODE
J
TOLERANCE
TD
TAPING*
TD, TE, BK
22R
NOMINAL
RESISTANCE
3 digits
TERMINATION
SURFACE MATERIAL
T: Sn
L: Sn/b
RF73 TD 220T J
RESISTANCE
TOLERANCE
J: ±5%
2A
STYLE
1J…3A
2A
RF73 1J 1.6 0.8 ± 0.1 0.3 ± 0.1 0.3 ± 0.1 0.5
+0.2
-0.1
0603 RF73 1J 0.063 W see below* 1Ω… 100Ω–2.6 W 2.4 W 2.1 W
J(±5%) 1 Ω1.1Ω… 20Ω22Ω… 100Ω–
*T.C.R. +1000 … -500ppm/K (1Ω… 3.3Ω), T.C.R. ±500ppm/K (3.6Ω… 100Ω)*For resistors operated at an ambient temperature of +70°C or above, the power rating shall be derated.
Old Part No.
New Part No.
(Pb-free)
+ 0.2
– 0.1
+ 0.2
– 0.1
0.4
0.4
(0.65±0.15)*
* Time of change to (0.65 ± 0.15) will be announced by PCN.
